Originally Posted by guthmund

3- People who don't acknowledge me when I do something nice for them...like hold the door. I get to work early, which means I open the door. As a courtesy, I stand aside and hold the door open for everyone (why you would line up outside a college library at 7:30 is beyond me, but there's always a sizeable crowd). More often than not, I get absolute silence as they file by me. Not even a cursory glance and head nod to say, "Hey, thanks for holding the door for me. Even though I won't verbally express my gratitude, this brief eye-contact and head nod should adequately cover it."